Altamount Pass Wind Farm

These are wind turbines at Altamount Pass, Livermore, California, USA.
It is about one hour
drive south east of
San Francisco,
right on the hills off the sides of
highway 580. It is a splendid place, but kinda eerie. When i opened my
car door, i heard a strange howling voice. I thought it's some kind of
animal, until i got out i realized it's the sound of the wind. The
winds are so gusty that i thought my car would be blown off the
ground, then i realized my irrationality because i'd have to fly first
before my car would. After 10 minutes, my ears start to hurt. As i
later found out, the wind speed there is some 8 meters per second.

The turbines form lines scattered on the hilltops, scattered around
a area of about 15 kilometers in diameter.
Hundreds are visible from the highway. According to online
info, there are over 4 thousands of them, being the world's largest
wind farm in terms of number of turbines. There are at least 7
varieties of wind turbines visible, including one type that is vertical like a
egg-beater. It is hard to get close to them, since there is no paved road leading to them, and the wind is too strong. There are many cows grazing on the field. I have only gotten close to
one of the smallest type , which is about perhaps 10 meters high with turbine blade about 1.5 meters long. One can hear the blades whooshing by when underneath it.
Some of them have cylindrical poles as their base, as opposed to metal struts. These are larger. Most photos are taken from a distance with a 8x-zoom camera.

Egg-beaters Design wind turbines.

Panorama. Photo by Steve Deutsch, 2003, used with permission.
4248×544

Altamount Pass wind farm is built in 1981 and are continuously upgraded with turbines of various makes and technologies, some of which are experimental. There are more than 4 thousands of them, but all of them are of the smaller type. These wind turbines are rather old. Modern wind turbines are gigantic in size, typically some 80 meters high (20 stories building). As of 2010, some modern turbines is to be gradually installed to replace the old small ones.

Satellites view at Google Map shows that these windturbines are spread around a area that's about 15 km in diameter. For more info about Altamount Pass, see Wikipedia:
Altamont Pass Wind Farm.